Optical information reading apparatus having an optical integrat

Details Optical information reading apparatus having an optical integrat Optical information reading apparatus having an optical integrat

1990-05-23

1992-09-01

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369109, 369114, G11B 7095

Patent

active

051446049

ABSTRACT:
An optical information reading apparatus comprises an optical integration circuit type pickup in which an optical waveguide for guiding light and a condensing coupler for condensing the guided light propagating within the optical waveguide are formed on an optical integration circuit substrate, sub-couplers for radiating a part of the injected light upon the information recording surface in the vicinity of a light spot formed by the optical pickup and subsidiary light detection elements for receiving reflection light of the light radiated from the sub-couplers reflected from the information recording surface. The sub-couplers and the subsidiary light detection elements are formed integrally with the optical pickup on the optical integration circuit substrate. Thereby the detection error can be reduced, it is not necessary to use attachment parts and therefore the apparatus can be integrated to thereby make it possible to minimize the size.

REFERENCES:
patent: 4716559 (1987-12-01), Hine
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4737946 (1988-04-01), Yamashita et al.
patent: 4779259 (1988-10-01), Kono et al.
patent: 4887255 (1989-12-01), Handa et al.
Optronics, 1989, pp. 149-154.
Shogo Ura et al, a Treatise entitled "An Integrated-Optic Disk Pickup Device", Department of Electronics, Faculty of Engineering, Osaka University.

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